EP3686639A1 - Glasfaserkabel - Google Patents

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Publication number
EP3686639A1
EP3686639A1 EP18858118.5A EP18858118A EP3686639A1 EP 3686639 A1 EP3686639 A1 EP 3686639A1 EP 18858118 A EP18858118 A EP 18858118A EP 3686639 A1 EP3686639 A1 EP 3686639A1
Authority
EP
European Patent Office
Prior art keywords
optical fiber
units
fiber cable
slot
stored
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18858118.5A
Other languages
English (en)
French (fr)
Other versions
EP3686639A4 (de
Inventor
Hiroki Ishikawa
Fumiaki Sato
Ryoei Oka
Yuki KAWAGUCHI
Sotaro Ida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP3686639A1 publication Critical patent/EP3686639A1/de
Publication of EP3686639A4 publication Critical patent/EP3686639A4/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4403—Optical cables with ribbon structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/449—Twisting
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4407—Optical cables with internal fluted support member
    • G02B6/4408—Groove structures in support members to decrease or harmonise transmission losses in ribbon cables
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/448—Ribbon cables
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4405—Optical cables with longitudinally spaced waveguide clamping

Definitions

  • the present disclosure relates to an optical fiber cable.
  • Patent Literature 1 discloses an optical cable in which optical fibers are stored in a state of being twisted into a slot groove.
  • Patent Literature 2 discloses an optical fiber cable in which optical fibers fixed by an intermittent fixing portion are stored in a state of being densely collected in a bundle and being twisted into slot grooves in a spiral shape.
  • An optical fiber cable according to an aspect of the present disclosure is an optical fiber cable including:
  • an optical fiber cable including a slot rod including a plurality of slot grooves it is known that optical fibers is stored in a twisted state in the slot groove in order to increase the density of the optical fiber cable (See Patent Literatures 1 and 2). In this case, it is desirable to form an optical fiber unit in which a certain number of fibers are stranded in order to identify the optical fibers stored in the slot groove.
  • the optical fibers when optical fiber units in which optical fibers are stranded in a slot groove are stored, in a case where large twisted distortion remains in the optical fibers, the optical fibers may be released from the slot groove, and there is a concern that deterioration of the transmission characteristics or a fiber break occurs.
  • the slot groove may be deepened so that the deterioration of the transmission characteristics or the fiber break does not occur, but in that case, an outer diameter of the optical fiber cable increases.
  • an object of the present disclosure is to provide an optical fiber cable that can suppress deterioration of transmission characteristics or a fiber break and can reduce the diameter.
  • optical fiber cable according to an aspect of the present disclosure is
  • the optical fibers in the optical fiber cable are easily bent, and thus the transmission characteristics are easily deteriorated.
  • the deterioration of the transmission characteristics is suppressed to realize the optical fiber cable with high density.
  • FIG. 1 is a cross-sectional view illustrating an example of an optical fiber cable according to the first embodiment.
  • an optical fiber cable 1A of the first embodiment includes optical fiber units 2 obtained by collecting a plurality of optical fiber ribbons 120, a slot rod 3 that stores the optical fiber units 2, a press-wrapping tape 4 that wraps a periphery of the slot rod 3, and a jacket 5 that covers an outer side of the slot rod 3.
  • slot rod 3 tensile strength members 31 are embedded in the center, and a plurality (eight in this example) of slot grooves 32 for storing the optical fiber units 2 are formed on the outer peripheral surface.
  • the slot rod 3 is formed of a resin material such as plastic.
  • the tensile strength members 31 are formed of a plurality (seven in this example) of wires (for example, steel wires or fiber reinforced plastic wires) having a resistance to tension and compression.
  • the tensile strength members 31 are provided in the longitudinal direction with respect to the optical fiber cable 1A.
  • the eight slot grooves 32 are formed, for example, in a spiral shape in one direction along the longitudinal direction of the optical fiber cable 1A.
  • Each slot groove 32 is partitioned by slot ribs 33 extending in a radial shape from the periphery of the tensile strength members 31.
  • the cross section of the slot groove 32 has a substantially U shape.
  • the press-wrapping tape 4 vertically or horizontally wraps the periphery of the slot rod 3 so that the optical fiber units 2 do not release from the slot grooves 32.
  • the press-wrapping tape 4 is formed of, for example, a nonwoven fabric formed in a tape shape.
  • the jacket 5 is formed of, for example, polyethylene (PE) or polyvinyl chloride (PVC).
  • the optical fiber units 2 in the present example are formed as secondary units obtained by collecting a plurality (three in the present example) of primary units 20 obtained by collecting the plurality (twelve in the present example) of optical fiber ribbons 120.
  • the number of the optical fiber ribbons 120 collected in one primary unit 20 may be 2 or more.
  • the secondary unit is configured with a plurality of primary units, the number of the primary units 20 collected in one secondary unit (optical fiber unit) 2 may be 2 or more.
  • the twelve optical fiber ribbons 120 included in each primary unit 20 are gathered to be assembled, and the optical fiber ribbons 120 are not twisted in the longitudinal direction of the optical fiber cable 1A and stranded in a spiral shape of one direction.
  • the optical fiber ribbons 120 are stranded with each other in a right strand. Then, the optical fiber ribbons 120 are stranded, while being untwisted in a left strand which is an opposite direction to the right strand, that is, being twisted in the opposite direction.
  • the expression "untwisted" means that each optical fiber ribbon is twisted in a direction in which the twist of each optical fiber ribbon occurring when the optical fiber ribbons are stranded with each other is cancelled.
  • the primary unit 20 is configured with four optical fiber ribbons 120A to 120D, as illustrated in a schematic view of Fig. 2 , the optical fiber ribbons 120A to 120D are untwisted in the primary units 20 to be stranded.
  • the twelve stranded optical fiber ribbons 120 may be bundled by a bundle member 25 for identification formed of a resin tape such as polyester.
  • the optical fiber ribbons 120 may be collected in an SZ-shaped strand as in a spiral shape in which the strand direction is periodically reversed.
  • the three primary units 20A to 20C included in the secondary units 2 are stranded in a spiral shape of one direction, while the primary units 20 (20A to 20C) are not twisted in the longitudinal direction of the optical fiber cable 1A.
  • the three primary units 20A to 20C are also stranded while being untwisted. That is, the primary units 20A to 20C are stranded while being twisted in a direction in which the twist of each of the primary units 20A to 20C occurring when the primary units 20 (20A to 20C) are stranded with each other is cancelled.
  • the three stranded primary units 20A to 20C may be bundled by a bundle member in the same manner as the above.
  • the primary units 20 (20A to 20C) may be collected in an SZ-shaped strand as in a spiral shape in which the strand direction is periodically reversed.
  • the secondary unit 2 is stored in the slot groove 32, for example, in a state of being untwisted stranding with respect to the slot groove 32 formed in a spiral shape, in the longitudinal direction of the optical fiber cable 1A. That is, the secondary unit 2 is stored in the slot groove 32 while being twisted in a direction in which the twist of the secondary unit 2 occurring when being stored in the slot groove 32 is cancelled.
  • Fig. 4 in order to simplify the description, only the secondary unit 2 in one slot groove 32 is illustrated, but the secondary units 2 are stored in the other slot grooves 32.
  • the secondary units 2 formed with three primary units are stored in each slot groove 32, but the present disclosure is not limited to this configuration.
  • one primary unit 20 may be stored in each of the slot grooves 32 (in Fig. 5 , in order to simplify the description, only the secondary unit 2 (the primary unit 20) in one slot groove 32 is illustrated).
  • a tertiary unit obtained by stranding a plurality of secondary units may be stored.
  • the optical fiber ribbon 120 may be an intermittent connection type optical fiber ribbon.
  • the optical fiber ribbon 120 in a state in which a plurality (twelve in the present example) of optical fibers 121 are arranged in parallel, connecting portions 122 in which the adjacent optical fibers 121 are connected to each other and non-connecting portions 123 in which the adjacent optical fibers 121 are not connected to each other are intermittently provided in the longitudinal direction.
  • the intermittent connection type optical fiber ribbon 120 in a state in which the optical fibers 121 are open in the arrangement direction is illustrated. Portions in which the connecting portions 122 and the non-connecting portions 123 are intermittently provided may be between a part of the optical fibers or may be between all of the optical fibers.
  • the optical fiber ribbons 120 are manufactured by intermittently applying connecting resins 124 such as an ultraviolet curing resin or a thermosetting resin to portions between the optical fibers so that the connecting portions 122 and the non-connecting portions 123 are intermittently formed. All of the optical fibers 121 are connected by applying the connecting resins 124 to the plurality of optical fibers 121. Subsequently, a portion of the connecting resins 124 is cleaved by a rotary blade or the like to form the non-connecting portions 123. In this manner, the intermittent connection type optical fiber ribbons 120 may be manufactured.
  • connecting resins 124 such as an ultraviolet curing resin or a thermosetting resin
  • the optical fiber 121 includes glass fibers configured with cores 121a and clads 121b and two coating layers (inner coating layers 121c and outer coating layers 121d) that cover the glass fibers.
  • the coating layers 121c and 121d are formed, for example, of an ultraviolet curable resin.
  • An outer diameter R1 of the optical fiber 121 is, for example, 125 ⁇ m to 190 ⁇ m.
  • An outer diameter R2 of the clads 121b (glass fiber) is, for example, 80 ⁇ m to 120 ⁇ m.
  • an increase in light loss caused by microbending is 5 dB/km or less.
  • Fig. 8 illustrates a manufacturing mechanism 40 having a configuration (a cage rotating type) in which a cage 42 accommodating supply bobbins 41 rotates when an optical fiber unit is manufactured.
  • Fig. 9 illustrates a schematic view of the cage 42 viewed from the front side (the right side in Fig. 8 ).
  • the manufacturing mechanism 40 can manufacture the primary units 20, for example, by stranding the optical fiber ribbons 120.
  • the manufacturing mechanism 40 can manufacture the secondary units 2, for example, by stranding the primary units 20.
  • the manufacturing mechanism 40 includes the supply bobbins 41 that send out the optical fiber ribbons 120 and the cage 42 to which the supply bobbins 41 are attached.
  • the manufacturing mechanism 40 includes a gathering plate 43 that arranges the sent optical fiber ribbons 120 to a predetermined position and a winding-up drum 44 that winds the manufactured primary units 20.
  • the plurality (twelve in the present example) of supply bobbins 41 are annularly attached to the cage 42 in a coaxial shape with a rotation shaft 42a of the cage 42.
  • the number of the attached supply bobbins 41 corresponds to the number of the optical fiber ribbons 120 included in the primary units 20.
  • Each of the supply bobbins 41 rotates about each rotation shaft 41a and sends out the optical fiber ribbons 120 wound around the supply bobbins 41 to the gathering plate 43.
  • the cage 42 rotates (clockwise rotate) about the rotation shaft 42a of the cage 42 in an arrow B direction according to the sending of the optical fiber ribbons 120 by the supply bobbins 41.
  • the optical fiber ribbons 120 are stranded with each other in a spiral shape in one direction by this rotation of the cage 42.
  • the cage 42 rotates at a predetermined speed according to the winding-up speed of the winding-up drum 44 so that a strand pitch of the stranded optical fiber ribbons 120 becomes a predetermined pitch.
  • the supply bobbins 41 rotate (counterclockwise rotates) to the cage 42 in an arrow C direction according to the rotation of the cage 42 in the arrow B direction so that the direction of the rotation shafts 41a of the supply bobbins 41 is maintained in a constant direction (a horizontal direction in the present example). That is, the supply bobbins 41 rotate on the cage 42 in a direction (the arrow C direction) opposite to the rotation direction (the arrow B direction) of the cage 42 so that the supply bobbins 41 always face the same direction.
  • the optical fiber ribbons 120 during the stranding are untwisted by the rotation of the supply bobbins 41, and are stranded without the twist of the optical fiber ribbons 120.
  • the maintained direction of the rotation shafts 41a of the supply bobbins 41 is not limited to the horizontal direction, and may be maintained in another angle.
  • the manufactured primary units 20 are wound around the winding-up drum 44 that rotates about a rotation shaft 44a in an arrow D direction.
  • the supply bobbins 41 when the secondary units 2 are manufactured, the supply bobbins 41 by the number (three in the present example) corresponding to the number of the primary units 20 included in the secondary unit 2 are attached to the cage 42.
  • the supply bobbins 41 rotate about the rotation shafts 41a and send out the primary units 20 wound around the supply bobbins 41 to the gathering plate 43.
  • the cage 42 rotates in the arrow B direction as in a case where the primary units 20 are manufactured according to the sending of the primary units 20. According to this rotation, the primary units 20 are stranded with each other in a spiral shape in one direction. The cage 42 rotates at a predetermined speed as the above. As in a case where the primary units 20 are manufactured, the supply bobbins 41 rotate in a direction opposite to the rotation direction of the cage 42 so that the direction of the rotation shafts 41a is maintained in a constant direction. According to this rotation, the primary units 20 are respectively untwisted and stranded. Also, the manufactured secondary units 2 are wound around the winding-up drum 44 as in the above. When tertiary units are manufactured, secondary units may be attached instead of the primary units, and thus the detailed description thereof is not provided.
  • Fig. 10 illustrates a manufacturing mechanism 50 having a configuration (winding rotation type) in which a winding-up drum 54 rotates when the optical fiber units are manufactured.
  • Fig. 11 illustrates a schematic view of a cage 52 viewed from the front side (a right side in Fig. 10 ).
  • the manufacturing mechanism 50 can manufacture the primary units 20 by stranding the optical fiber ribbons 120 and can manufacture the secondary units 2 by stranding the primary units 20.
  • the manufacturing mechanism 50 includes supply bobbins 51, the cage 52, a gathering plate 53, and the winding-up drum 54. This configuration is the same configuration as the manufacturing mechanism 40.
  • the manufacturing mechanism 50 includes a guide roller 55 that guides the manufactured primary units 20 to the winding-up drum 54.
  • the supply bobbins 51 are attached to the cage 52 by the number corresponding to the number of the optical fiber ribbons 120 included in the primary units 20.
  • the supply bobbins 51 rotate about rotation shafts 51a and send out the optical fiber ribbons 120 wound around the supply bobbins 51 to the gathering plate 53.
  • the optical fiber ribbons 120 are stranded with each other in a spiral shape in one direction by the rotation of the winding-up drum 54.
  • the winding-up drum 54 rotates about an axis of an arrow E direction which is a pass line direction of the primary units 20 in an arrow F direction.
  • the optical fiber ribbons 120 rotate in an arrow G direction in synchronization with the rotation of the winding-up drum 54. Accordingly, the optical fiber ribbons 120 are stranded with each other in a spiral shape in one direction.
  • the supply bobbins 51 rotate in the same direction as the rotation direction (the arrow F direction) of the winding-up drum 54 toward the winding-up drum 54. That is, as illustrated in Fig. 11 , the supply bobbins 51 rotate in a direction (an arrow H direction) in which the direction of each of the rotation shafts 51a of the supply bobbins 51 in the cage 52 changes. In this case, the cage 52 does not rotate.
  • the supply bobbins 51 rotate about the rotation shafts 51a while rotating in the arrow H direction and send out the optical fiber ribbons 120.
  • each of the optical fiber ribbons 120 during the stranding is untwisted. Accordingly, the optical fiber ribbons 120 are stranded without the twist.
  • the supply bobbins 51 when the secondary units 2 are manufactured, the supply bobbins 51 by the number corresponding to the number of the primary units 20 included in the secondary units 2 are attached to the cage 52.
  • the supply bobbins 51 rotate about the rotation shafts 51a and send out the primary units 20 wound about the supply bobbins 51 to the gathering plate 53.
  • the winding-up drum 54 rotates in the arrow F direction.
  • the optical fiber ribbons 120 are stranded in the spiral shape in one direction.
  • the supply bobbins 51 rotate in the same direction as the rotation direction of the winding-up drum 54, in synchronization with the rotation of the winding-up drum 54.
  • the primary units 20 are untwisted and stranded.
  • secondary units may be attached instead of the primary units, and thus the detailed description thereof is not provided.
  • a manufacturing apparatus 60 of the optical fiber cable 1A includes a supply drum 70 that sends out the slot rod 3, a cage 62, supply bobbins 61 accommodated in the cage 62, a gathering plate 63, a tape supply 66, and a winding-up drum 64.
  • the supply drum 70 rotates in an arrow K direction about an arrow J direction which is a pass line direction of the slot rod 3.
  • the supply drum 70 sends out the slot rod 3 toward a guide roller 65a.
  • the sent slot rod 3 rotates in an arrow L direction in synchronization with the rotation of the supply drum 70.
  • the rotation speed of the supply drum 70 in the arrow K direction is controlled to a predetermined speed according to the speed of sending out the slot rod 3.
  • the slot rod 3 rotates at a predetermined speed in the arrow L direction. Accordingly, the slot grooves 32 of the slot rod 3 formed in a spiral shape are sent out to be always at the same position in the circumferential direction of the slot rod 3, at the position of the gathering plate 63.
  • the supply bobbins 61 by the number (eight in the present example) corresponding to the number of the slot grooves 32 formed in the slot rod 3 are attached to the cage 62.
  • the secondary units 2 manufactured by the manufacturing mechanism of Fig. 8 or 10 are wound around the supply bobbins 61.
  • the supply bobbins 61 rotate about the rotation shafts 61a and send out the secondary units 2 to the gathering plate 63.
  • the secondary units 2 arranged in a predetermined position by the gathering plate 63 are stored in the slot grooves 32 of the slot rod 3.
  • the supply bobbins 61 rotate in the same direction (an arrow M direction) as the rotation direction (the arrow L direction) of the slot rod 3 on the cage 62.
  • the secondary units 2 stored in the slot grooves 32 are not twisted and stored in the slot grooves 32 without the twist of the secondary units 2.
  • the primary units 20 (the three primary units 20A to 20C in the present example) included in the stored secondary units 2 are stranded with each other. Therefore, as illustrated in a schematic view of Fig.
  • the primary units are stored while the positions in the slot grooves 32 are changed (for example, positioned on the bottom side or positioned on the upper side of the slot grooves 32) (in Fig. 13 , the primary units 20A to 20C in one slot groove 32 are only illustrated for description).
  • the outer periphery of the slot rod 3 in which the secondary units 2 are stored is press-wrapped by the press-wrapping tape 4 sent out from the tape supply 66.
  • the optical fiber cable 1A in a state of being wrapped with the press-wrapping tape 4 is sent toward the winding-up drum 64 via a guide roller 65b and wound around the winding-up drum 64.
  • the winding-up drum 64 rotates in the arrow F direction which is the same direction as the arrow K direction of the supply drum 70 in synchronization with the rotation of the supply drum 70.
  • the optical fiber cable 1A wound around the winding-up drum 64 rotates in the same direction (the arrow G direction) as the rotation direction (the arrow L direction) of the slot rod 3 sent out from the supply drum 70. Therefore, the optical fiber cable 1A is wound around the winding-up drum 64 without being twisted.
  • the present example is not limited to this configuration in which the secondary units 2 formed with three primary units are stored in each of the slot grooves 32.
  • one primary unit 20 may be accommodated in each of the slot grooves 32.
  • the primary units 20 are wound around each of the supply bobbins 61 of the cage 62, and the primary units 20 sent out from the supply bobbins 61 are stored in the slot grooves 32 as in the secondary units 2.
  • Tertiary units formed with a plurality of secondary units may be stored.
  • the secondary units 2 are stranded in the longitudinal direction of the optical fiber cable 1A in a state in which the primary units 20 are not twisted. Therefore, it is possible to prevent the primary units 20 from being crossed with each other and twisted.
  • the primary units 20 are stranded in the longitudinal direction of the optical fiber cable 1A, in a state in which the optical fiber ribbons 120 are not twisted. Therefore, it is possible to prevent the optical fiber ribbons 120 from being crossed with each other and twisted. Accordingly, the optical fibers 121 that configure the optical fiber ribbons 120 do not twist and distort. Accordingly, the stranded optical fibers 121 do not outwardly spread and deterioration of the transmission characteristics and a fiber break can be suppressed.
  • the secondary units 2 are stored in the slot grooves 32 formed in a spiral shape in a state of being untwisted, the secondary units 2 are not twisted. Therefore, the repulsive force that outwardly spread the stored secondary units 2 is not generated. Even when the slot grooves 32 are not deepened, there is no concern of releasing the secondary units 2 from the slot grooves 32. For example, there is no concern that a portion of the secondary units 2 is interposed with the press-wrapping tape 4. Accordingly, the deterioration of the transmission characteristics and the fiber break of the optical fibers 121 can be suppressed, and also the outer diameter of the optical fiber cable 1A can be reduced. Further, the yield in the process of manufacturing the optical fiber cable 1A increases, and thus the manufacturing cost can be reduced.
  • the shape thereof in the slot groove cross section can be freely changed. Therefore, the space in the slot grooves 32 can be efficiently used. Accordingly, the density of the optical fiber cable 1A can be made higher than when the optical fiber ribbons 120 are not the intermittent connection type.
  • the optical fibers 121 can be stored in the optical fiber cable 1A with high density.
  • the outer diameter R1 of the optical fibers 121 can be finer than that of general optical fibers (outer diameter of 250 ⁇ m)
  • the optical fibers 121 can be stored in the optical fiber cable 1A with high density.
  • the outer diameter R2 of the clads 121b the diameter of the optical fibers 121 can be reduced while the coating thickness is secured.
  • the optical fibers 121 can be stored in the optical fiber cable 1A with high density.
  • the optical fibers 121 in the optical fiber cable 1A are easily bent, and thus the transmission characteristics are easily deteriorated.
  • the optical fibers 121 of the present example have microbend loss resistance described above, while the deterioration of the transmission characteristics is suppressed, the optical fiber cable 1A with high density can be realized.
  • Fig. 14 is a cross-sectional view illustrating an example of an optical fiber cable according to the second embodiment.
  • a plurality (three in the present example) of secondary units (optical fiber units) 2 are stored in each of the slot grooves 32.
  • the optical fiber cable 1B according to the second embodiment is different from the optical fiber cable 1A according to the first embodiment in which one secondary unit 2 is stored in each of the slot grooves 32.
  • Configurations which are the same as in the optical fiber cable 1A according to the first embodiment are denoted by the same reference numerals, and the descriptions thereof are omitted.
  • the secondary units 2 As illustrated in a schematic view of Fig. 15 , for example, with respect to the three secondary units 2 stored in the slot grooves 32, the secondary units 2 (2A to 2C) are stranded with each other in the longitudinal direction of the optical fiber cable 1B. Accordingly, while the secondary units are stored while the positions in the slot grooves 32 are changed (for example, positioned on the bottom side or positioned on the upper side of the slot grooves 32) (in Fig. 15 , the secondary units 2A to 2C in one slot groove 32 are only illustrated for description).
  • the three secondary units 2 stored in the slot grooves 32 are stranded with each other and stored in the slot grooves 32 in the longitudinal direction of the optical fiber cable 1B, while the strand direction of the secondary units 2 is periodically changed (for example, the S strand and the Z strand are alternately repeated).
  • a manufacturing apparatus 80 of the optical fiber cable 1B includes twistable tables 81 in which the strand direction of the optical fiber units 2 can be periodically changed.
  • the same configurations as in the manufacturing apparatus 60 are denoted by the same reference numerals, and the descriptions thereof are omitted.
  • the supply bobbins 61 by the number obtained by multiplying the number (eight in the present example) of the slot grooves 32 formed in the slot rod 3 and the number (three in the present example) of the secondary units 2 stored in one slot groove 32 are attached to the cage 62. That is, 24 (8 ⁇ 3) supply bobbins 61 are attached to the cage 62.
  • the secondary units 2 manufactured by the manufacturing mechanism of Fig. 8 or 10 are wound around the supply bobbins 61.
  • the supply bobbins 61 rotate about the rotation shafts 61a and send out the secondary units 2 to the twistable tables 81.
  • a plurality of holes 81b through which the sent secondary units 2 can pass are formed in the twistable table 81.
  • the holes 81b are annularly formed in a coaxial shape with a rotation shaft 81a of the twistable table.
  • the holes 81b are formed to correspond to the number of the stranded secondary units 2.
  • the three holes 81b are formed in the twistable table 81 of the present example.
  • the twistable tables 81 are provided by the number (eight in the present example) which is the same as the number of the slot grooves 32 formed in the slot rod 3.
  • ⁇ 90° in the present example
  • the three secondary units 2 that pass through the twistable table 81 are stranded with each other while the strand direction is periodically changed, that is, are SZ-stranded and stored in the slot grooves 32.
  • the three secondary units 2 are stored while the positions in the slot grooves 32 are changed.
  • one slot groove 32 can store the plurality of secondary units 2. Therefore, a larger number of optical fiber ribbons 120 can be stored in each of the slot grooves 32, and thus it is advantageous to reduce the diameter of the optical fiber cable 1B.
  • the plurality of secondary units 2 stored in the same slot groove 32 are stored in the longitudinal direction of the optical fiber cable 1B while positions are switched with each other in the slot grooves 32.
  • a unit on the upper side of the slot groove is stored while drawing a longer trajectory than a unit on the bottom side of the slot groove, and thus is required to be formed to be longer than the optical fiber unit on the bottom side.
  • the optical fiber unit of which the length is changed according to the position (the upper side, the bottom side, or the like) in the slot groove is prepared in advance and arranged in a position therefor in an assembly (storing in the slot groove) process, and thus the manufacturing process becomes complicated. Also, there is a concern that a discard loss of discarding the optical fiber unit for the extra length is generated.
  • the manufacturing process can be prevented from being complicated, the generation of the discard loss of the secondary units 2 can be prevented, and thus the reduction in the manufacturing cost can be achieved.
  • the secondary units 2 are stranded with each other and stored in the slot grooves 32 while the strand directions of the secondary units 2 are periodically changed. Therefore, even when the cage 62 accommodating a large number (24 in the present example) of supply bobbins 61 is not rotated, the secondary units 2 can be stranded by reversing and rotating the twistable tables 81. Accordingly, even when a cable including a large number of the accommodating optical fiber ribbons 120 is manufactured, it is possible to prevent the increase in the size of the manufacturing apparatus 80, and thus the reduction of the manufacturing cost can be achieved.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Light Guides In General And Applications Therefor (AREA)
EP18858118.5A 2017-09-21 2018-09-20 Glasfaserkabel Withdrawn EP3686639A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017181585 2017-09-21
PCT/JP2018/034725 WO2019059251A1 (ja) 2017-09-21 2018-09-20 光ファイバケーブル

Publications (2)

Publication Number Publication Date
EP3686639A1 true EP3686639A1 (de) 2020-07-29
EP3686639A4 EP3686639A4 (de) 2021-06-09

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EP18858118.5A Withdrawn EP3686639A4 (de) 2017-09-21 2018-09-20 Glasfaserkabel

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US (1) US20200225432A1 (de)
EP (1) EP3686639A4 (de)
JP (1) JPWO2019059251A1 (de)
CN (1) CN111149033A (de)
WO (1) WO2019059251A1 (de)

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WO2018230618A1 (ja) * 2017-06-14 2018-12-20 住友電気工業株式会社 スロット型光ケーブル
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